无法创建PoolableConnectionFactory（通信链路故障）-Jmeter

我正在尝试测试数据库，但它给了我无法创建PoolableConnectionFactory（通信链路故障）错误

Jdbc连接配置：

database url: 
jdbc:mysql://codebytenepal.com.np:3306/database_cbn

为了测试我是否做错了什么，我在db4free.net中创建了testdb，它工作得非常好

database url in jdbc connection: 
jdbc:mysql://db4free.net:3306/shrestha

这是可行的，但上面的方法不行。原因可能是什么

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提前感谢

您尝试访问的主机没有打开端口3306，报告证明了这一点

对于其他主机，端口3306处于打开状态：

root@af33db8ee27e:/# nmap -F db4free.net

Starting Nmap 7.60 ( https://nmap.org ) at 2020-10-13 15:58 UTC
Nmap scan report for db4free.net (85.10.205.173)
Host is up (0.016s latency).
Not shown: 96 filtered ports
PORT     STATE SERVICE
22/tcp   open  ssh
80/tcp   open  http
443/tcp  open  https
3306/tcp open  mysql

Nmap done: 1 IP address (1 host up) scanned in 16.49 seconds

因此，我们绝对希望您无法建立到codebytenepal.com.np:3306的连接，因为它不向世界开放

如果您确实需要测试它，您需要：

192.3.201.45地址

在您的端口中打开端口3306

但是请注意，它会在部署中打开一个窗口，因此在完成测试后恢复更改

更多信息：

root@af33db8ee27e:/# nmap codebytenepal.com.np

Starting Nmap 7.60 ( https://nmap.org ) at 2020-10-13 15:53 UTC
Nmap scan report for codebytenepal.com.np (192.3.201.45)
Host is up (0.0016s latency).
Not shown: 965 filtered ports
PORT      STATE  SERVICE
21/tcp    open   ftp
22/tcp    closed ssh
25/tcp    open   smtp
26/tcp    open   rsftp
53/tcp    open   domain
80/tcp    open   http
110/tcp   open   pop3
143/tcp   open   imap
443/tcp   open   https
587/tcp   open   submission
993/tcp   open   imaps
995/tcp   open   pop3s
8080/tcp  closed http-proxy
8443/tcp  closed https-alt
8888/tcp  open   sun-answerbook
49152/tcp closed unknown
49153/tcp closed unknown
49154/tcp closed unknown
49156/tcp closed unknown
49157/tcp closed unknown
49159/tcp closed unknown
49160/tcp closed unknown
49165/tcp closed unknown
49175/tcp closed unknown
49400/tcp closed compaqdiag
50000/tcp closed ibm-db2
51103/tcp closed unknown
52822/tcp closed unknown
54045/tcp closed unknown
54328/tcp closed unknown
55056/tcp closed unknown
55600/tcp closed unknown
56737/tcp closed unknown
62078/tcp closed iphone-sync
65129/tcp closed unknown

root@af33db8ee27e:/# nmap -F db4free.net

Starting Nmap 7.60 ( https://nmap.org ) at 2020-10-13 15:58 UTC
Nmap scan report for db4free.net (85.10.205.173)
Host is up (0.016s latency).
Not shown: 96 filtered ports
PORT     STATE SERVICE
22/tcp   open  ssh
80/tcp   open  http
443/tcp  open  https
3306/tcp open  mysql

Nmap done: 1 IP address (1 host up) scanned in 16.49 seconds